{"id":"F2006B10453","name":"AD/HS 125/170 - Wing and Fuselage Attachment Bolts","slug":"ad-hs-125-170-wing-and-fuselage-attachment-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116169,"registerId":"commonwealth-F2006B10453-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nBritish Aerospace BAe 125 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/HS 125/170 Wing and Fuselage Attachme","sectionType":"part","heading":"AD/HS 125/170 Wing and Fuselage Attachment Bolts 7/2003","content":"# AD/HS 125/170 Wing and Fuselage Attachment Bolts 7/2003\n\nApplicability: Model Hawker 800XP and 800 aircraft, with serial numbers 258287 through 258390; excluding serial numbers 258289, 258291, 258292, 258293, 258294, 258295,\n\n258301, 258303, 258310, 258312, 258313, 258315, 258321, 258336, and 258343.\n\nRequirement: 1. For Model Hawker 800XP aircraft identified in effectivity of Raytheon Service Bulletin SB 51-3408, dated October 2000, excluding Service Bulletin/Kit Drawing Report Fax: Inspect in accordance with above referenced service bulletin.\n\n    2. For Model Hawker 800XP aircraft identified in effectivity of Raytheon Service Bulletin SB 51-3426, Revision 1, dated November 2001, excluding Service Bulletin/Kit Drawing Report Fax: Inspect in accordance with above referenced service bulletin. Inspection before the effective date of this Directive in accordance with the original issue of above referenced service bulletin, is acceptable for compliance with the inspection requirements only for those locations identified in the original service bulletin; Revision 1 requires inspections at additional locations.\n\n    3. For Model Hawker 800 aircraft identified as Group A aircraft in Raytheon Service Bulletin SB 51-3421, Revision 1, dated November 2001, including Appendix 1, dated December 2000, excluding Service Bulletin/K it Drawing Report Fax: Inspect in accordance with above referenced service bulletin. Inspection before the effective date of this Directive in accordance with the original issue of above referenced service bulletin, including Appendix 1, is acceptable for compliance with this inspection requirement for Group A aircraft.\n    4. For Model Hawker 800 aircraft identified as Group B aircraft in Raytheon Service Bulletin SB 51-3421, Revision 1, dated November 2001, including Appendix 1, dated December 2000, excluding Service Bulletin/Kit Drawing Report Fax: Inspect in accordance with above referenced service bulletin. Inspection before the effective date of this Directive in accordance with the original issue of above referenced service bulletin, including Appendix 1, is acceptable for compliance with the inspection requirement only for those locations identified in the original service bulletin; Revision 1 requires inspections at additional locations.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The AD expands inspection coverage relative to earlier service bulletin issues by incorporating Revision 1 of SB 51-3426 and Revision 1 of SB 51-3421, which add additional inspection locations; it also specifies that only inspections done before the AD under the original service bulletin count for the original locations (Requirement paras 2–4)."},"complexity_factors":["Narrow serial-number applicability with a list of inclusive and explicitly excluded serial numbers (Applicability).","Multiple referenced service bulletins and revisions (SB 51-3408, SB 51-3426 Rev 1, SB 51-3421 Rev 1) with differing effectivity and inspection locations (Requirement paras 1–4).","Conditional acceptance of pre-existing inspections: earlier inspections are acceptable only for locations identified in the original service bulletins, while revisions require additional locations (Requirement paras 2–4).","Technical inspection work likely requiring qualified maintenance organisations and potential repair/part‑replacement costs (Requirement generally).","Administrative burden of matching each aircraft to the correct service bulletin effectivity and revision status for compliance tracking (Applicability; Requirement).","Regulatory issuance under a CASA delegate (preamble referencing subregulation 39.1(1) of CASR 1998) — limited administrative discretion in giving effect to the AD."],"plain_english_summary":"This Airworthiness Directive requires inspections of wing-to-fuselage attachment bolts on specified Hawker 800 and 800XP aeroplanes, using procedures in named Raytheon service bulletins. It affects operators and maintenance organisations for the listed serial-numbered aircraft because it makes those inspections mandatory and ties compliance to particular service‑bulletin revisions.\n\nOperators pay for inspections and any repairs; the AD permits certain earlier inspections to satisfy the requirement only for locations listed in the original service bulletin, while later revisions add inspection locations."},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This appears to be a focused safety directive addressing a specific structural defect in a defined aircraft population. The scope remains tightly constrained to wing-fuselage attachment bolt inspections on the specified Hawker aircraft models. There is no evidence of scope creep beyond the original airworthiness safety purpose."},"complexity_factors":["Multiple overlapping applicability criteria: model type, serial number ranges, AND specific excluded serial numbers","Four distinct requirement paragraphs with cross-references to external manufacturer documents (Raytheon Service Bulletins SB 51-3408, SB 51-3426 Rev 1, and SB 51-3421 Rev 1 with Appendix 1)","Nested conditional logic: 'excluding Service Bulletin/Kit Drawing Report Fax' clause appears in all four requirements without explanation of what this exclusion means","Grandfathering provisions with limitations: prior inspections acceptable only for 'those locations identified in the original service bulletin' but not for 'additional locations' required by revised bulletins","Manufacturer-defined groupings ('Group A' and 'Group B') referenced but not defined within the directive itself","No defined terms section, but heavy reliance on external technical documents not reproduced in the directive"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections of wing-to-fuselage attachment bolts on specified Hawker 800XP/800 (BAe 125 series) aircraft, following the manufacturer’s service bulletins. It applies to a defined range of serial numbers (with certain exclusions) and is legally mandatory under Australian aviation law.\n\nThe measure addresses an identified unsafe condition: failure of these structurally critical bolts could lead to wing separation, so timely compliance is required to ensure continued airworthiness."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-170-wing-and-fuselage-attachment-bolts","history":"/api/acts/ad-hs-125-170-wing-and-fuselage-attachment-bolts/history","analysis":"/api/acts/ad-hs-125-170-wing-and-fuselage-attachment-bolts/analysis","conflicts":"/api/acts/ad-hs-125-170-wing-and-fuselage-attachment-bolts/conflicts","importantCases":"/api/acts/ad-hs-125-170-wing-and-fuselage-attachment-bolts/important-cases","documents":"/api/acts/ad-hs-125-170-wing-and-fuselage-attachment-bolts/documents"}}